◎ 题干
Sharks have been in the earth for              years.

A. thousands of
B. two thousands
C. two thousands of
D. thousand of
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Sharks have been in the earth foryears. [ ]A. thousands of B. two thousands C. two thousands of D. thousand of …”主要考查了你对  【基数词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。